2014422http://basparesh.ippi.ac.ir/article_1115_93c20404852a67615de0f69866fbe65c.pdfdx.doi.org/10.22063/basparesh.2014.1115A Brief Overview on Biodegradable Polymers
in Drug Delivery SystemsArezouMashakauthortextarticle2014perFabrication of polymeric biodegradable products has gained much attention in solving
environmental pollution, safety and health problems. Furthermore, the biodegradable
polymers have been developed in medicine and drug delivery fields to avoid post-operation
removal of the implants at the end of their functional life. This article introduces some
conventional biodegradable natural and synthetic polymers in medical and drug delivery
applications. In this respect, some factors which may affect degradation and drug delivery
profiles and also, commercial devices based on these polymers are introduced and discussed.
Finally, the physical and mechanical properties of biodegradable polymers are compared
so to be able to choose the most suitable systems in relation to their specific applications.BaspareshIran Polymer and Petrochemical Institute2252-04494

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20142335http://basparesh.ippi.ac.ir/article_1116_c4918c4112a010dda09b0cecc0d2b944.pdfdx.doi.org/10.22063/basparesh.2014.1116Preparation Methods and Improvement of
Oxidation Resistance of Carbon AerogelMohammad MehdiSerajiauthorNafisehSadat GhaforianauthorAhmad RezaBahramianauthortextarticle2014perCarbon foams based on polymeric resins and precursors, due to such properties as low
thermal conductivity, good thermal stability, high specific strength and low density,
are used in different industries, especially aerospace, as high temperature insulator, thermal
shields and material protecting structures. In this study, current methods of preparing
carbon nanostructures are introduced. By a polymeric template method polymeric foam and
aerogel are produced using the foaming process of polymer precursors of phenolic resins
and sol-gel formation. Then, the polymeric nanostructure transforms into carbon foams
in a carbonization process. Nevertheless, structural destruction due to oxidation reaction
has limited the application of these nanostructures at temperature higher than 400˚C in
the air atmosphere. In the next step, the oxidation mechanism of carbon foams is studied.
In addition to control and optimization of the process parameters such as temperature of
carbonization process, the oxidation-resistant material such as silicon carbide compounds
can be used to improve the oxidation resistance of carbon aerogel. Finally, the role of
formation of a silicon carbide layer on the surface of carbon pores wall, and the formation
of SiC bonds in the carbon aerogel structure by alkoxy silane polymers, as efficient methods
that increase the oxidation resistance of the carbon foam, is investigated.BaspareshIran Polymer and Petrochemical Institute2252-04494

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20143645http://basparesh.ippi.ac.ir/article_1117_86c2ce4c3870525d215fd34b3b68556a.pdfdx.doi.org/10.22063/basparesh.2014.1117Controlled Morphology of Nanoclay
within Nanopolymer Particles via
Miniemulsion PolymerizationMojganMirzataheriauthortextarticle2014perControlled morphology of nanoclay layers within nanopolymer particles is a very
important topic for most industries, especially in food and medical packaging. Films
prepared from these nanocomposites showed improved physical and mechanical properties
and high impermeability towards gases, vapors, water and even oils and hydrocarbons.
One successful method to design these systems is by miniemulsion polymerization which
is useful for encapsulation of all materials (solids, liquids and gases) within polymer
particles, provided a suitable choice of surfactant is made with optimum HLB. Another
method is "pickering" or soap free polymerization, which can also be performed in the form
of miniemulsion. In this new method nanoclay is used instead of a surfactant, and therefore,
final films will show honeycomb structures applicable in impermeable packaging purposes.BaspareshIran Polymer and Petrochemical Institute2252-04494

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20144657http://basparesh.ippi.ac.ir/article_1118_b324654cd98961da0cac0782692a910a.pdfdx.doi.org/10.22063/basparesh.2014.1118Oral Thin FilmsArezouSoroushniaauthorFaribaGanjiauthortextarticle2014perOral route is the most preferred route by medical practitioners and manufacturer due
to patient's acceptability. Fast dissolving tablets have been developed because of low
bioavailability and weak acceptability of pediatric and geriatric patients who experience
difficulties in swallowing the traditional oral solid-dosage forms. As a result of low
bioavailability of fast dissolving tablets, oral thin films have been developed. These films
are the most advanced form of oral solid dosages due to more flexibility and comfort and
include a polymer, an active ingredient, flavoring and coloring agents, and surfactants.
Oral thin films are made mostly with solvent casting and hot melt extrusion. Oral strips are
evaluated for various attributes such as thickness, disintegration and dissolution study and
mechanical properties. These films have many applications such as taste masking, fast and
sustainable drugs release. At the moment, film formulations with encapsulated drugs are
commercially launched using the oral film technology. It is predicted that the value of the
overall oral thin film market will grow significantly.BaspareshIran Polymer and Petrochemical Institute2252-04494

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20145870http://basparesh.ippi.ac.ir/article_1119_1f5eead7f13323b6e2b7c5439aca540b.pdfdx.doi.org/10.22063/basparesh.2014.1119Population Balance Methods for Modeling
of Sulfur Vulcanization of Natural Rubber
CompoundsMaryamSabetzadehauthorRouhollahBagheriauthortextarticle2014perThe population balance methods are employed to model sulfur vulcanization process of
natural rubber (NR) compounds. The proposed primary models are so far empirical and/
or mechanistic and have various limitations that do not embody all reactions and formation
of all the process products. In this work, the models are developed, using population
balance methods that explicitly acknowledge the nature of all the formed species and the
various types of reactions. The kinetic model can also accurately describe the complete
cure responses including the scorch delay, cure time and the reversion for a wide range of
compositions, using a single set of rate constants. In addition, the concentration profiles
of all the reaction intermediates as a function of polysulfidic lengths are predicted. The
population balance model provides a quantitative framework for explicitly incorporating
mechanistically reasonable chemistry of the vulcanization process of different natural
rubber compounds.BaspareshIran Polymer and Petrochemical Institute2252-04494

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20147181http://basparesh.ippi.ac.ir/article_1120_138c17410fff997aee24d600ada8ef4a.pdfdx.doi.org/10.22063/basparesh.2014.1120Polyvinyl Alcohol Biodegradable
Nanocomposites, Reinforced with
NanocelluloseMostafaYahyaviauthortextarticle2014perPolymer nanocomposites are very important materials of recent times, because of
their significantly enhanced mechanical properties and thermal stability versus neat
polymers or conventional polymer composites. A nanocomposite describes a two-phase
material where one of the phases has at least one dimension in nanometer range (1-100 nm).
The use of natural fibers as reinforcements in polymers and composites has attracted much
attention due to the environmental concerns. Nanocellulose is one of the most abundant
renewable natural polymers, exhibiting a number of well-known advantages, such as
low cost, worldwide availability, biodegradability, high stiffness and good mechanical
properties. Particular attraction is its low density that leads to high specific mechanical
properties. Polyvinyl alcohol is water soluble, semi-crystalline, fully biodegradable,
non-toxic, and biocompatible. Therefore, nanocellulose can be used in reinforcement of
polymer nanocomposites.BaspareshIran Polymer and Petrochemical Institute2252-04494